Deflecting yoke

ABSTRACT

A toroidal-type deflecting yoke for use in television receivers, wherein a ring core having an elliptical cross section is longitudinally divided into two sections. Coils having a greater number of turns are wound on the two core sections respectively, the core sections having the coils wound thereon being joined to each other. Coils having a lesser number of turns are wound on the joined portions of said core sections, so that the winding of the coils can be effectively performed.

United States Patent Minoru Nakano Ashiya; Takashi Tsutsumi, Suita;Tokuzo Kadota, Moriguchi, all of Japan Appl. No. 11,589

lnventors Filed Feb. 16, 1970 Patented Jan. 1 l, 1972 AssigneeMatsushita Electric Industrial Co., Ltd.

Osaka, Japan Priorities Mar. 28, 1969 Japan 44/24003; Mar. 28, 1969,Japan, No. 44/24004 DEFLECTING YOKE 4 Claims, 5 Drawing Figs.

U.S. Cl 335/210, 3 35/2 1 3 Int. Cl 1101! 7/00 Field of Search 335/210,

References Cited UNITED STATES PATENTS 3,246,192 4/1966 Torsch 335/213x3,548,350 12 1970 Archer 313/7sx 3,430,169 2/1969 Gabor... 335/2133,489,972 1/1970 Lasky 335/213 FOREIGN PATENTS 1,343,249 10/1963 France335/210 Primary Examiner-George Harris Attorney-Stevens, Davis, Miller &Mosher ABSTRACT: A toroidal-type deflecting yoke for use in televisionreceivers, wherein a ring core having an elliptical cross section islongitudinally divided into two sections. Coils having a greater numberof turns are wound on the two core sections respectively, the coresections having the coils wound thereon being joined to each other.Coils having a lesser number of turns are wound on the joined portionsof said core sections, so that the winding of the coils can beeffectively performed.

DEFLECTING YOKE This invention relates to a deflecting yoke.

The toroidal deflecting yoke is advantageous over the saddle-typedeflectingyoke in that it provides improved deflection efficiency and Ican be small in size since the coils are wound directly on the core.However, a special winding machine is required for winding the coils onthe ringlike core, so that with an increased number of turns, efficientwinding of the coils' becomes impossible. Therefore, it is presently thepractice to make only one of the two windings toroidal.

It is an object of the present invention to make it possible toefficiently wind both coils toroidally.

Another object of the present invention is to improve the insulation ofboth windings when the foregoing object has been achieved.

Still another object of the present invention is to provide a deflectingyoke having improved deflection efficiency.

Other objects, features and advantages of the present invention willbecome apparent from the following description taken in conjunction withthe following drawings, in which:

- FIG. 1 is a perspective view showing the deflecting yoke ac cording toan embodiment of the present invention;

FIG. 2 is an exploded view illustrating the assembling process of saiddeflecting yoke;

FIG. 3 is a cross-sectional view of the deflecting yoke; and

FIGS. 4a and 4b show the insulating frames for the yoke of FIGS. 13.

A special toroidal winding machine is required for effecting toroidalwinding with respect to a ringlike core, but if the core is divided intotwo pieces, then such winding can be carried out by an ordinary windingmachine, and yet a high winding speed can be attained. In view of this,a coil having a greater number of turns is bisectioned to be wound ascoil sections 1A and 18 on two sections 2A and 2B of a ringlike core bymeans of an ordinary winding machine respectively, as shown in FIGS. 1to 3. Then the two core sections 2A and 28 having the coil sections 1Aand 1B wound thereon respectively are placed in contact with each other,and thereafter ringlike insulating frames 3A and 3B are fitted on theopposite ends of the core sections, so that the two core sections 2A and2B are held in position and at the same time the coil sections 1A and 1Bare insulated from other coils 4 which are wound on the ringlikeinsulating frames 3A and 38 respectively. By grooving the insulatingframes 3A and 3B, the winding of the coils 4 can be facilitated. Thecoils 4 can be easily wound because of the lesser number of turnsthereof, although the winding of them is performed by means of atoroidal winding machine. Incidentally, it is required that the coils ofthe deflecting yoke be wound in the form of a cosine distribution forthe purpose of producing a uniform magnetic field. With such anarrangement, the thickness of the coils is higher at positions where thewinding density is greater, and it becomes smaller towards theperipheral portions of the coils which are remotest from saidpositions-Due to the fact that the number of turns of the deflectingcoils 1A and 1B is greater than that of the other tional circular coreis used. Therefore, the cross-sectional configuration of the coreconsisting of the core sections 2A and 28 disposed in contact with eachother may be slightly elliptical. By doing so, the respective coils 1A,1B and 4 are disposed in close contact with the picture tube neck, sothat a higher deflection efficiency can be achieved.

As described above, the toroidal deflecting yoke is constructed bydividing a ring core having an elliptical cross section into twosections, winding deflecting coils having a greater number of turns onthe two core sections respectively, placing the core sections having thecoils wound thereon in contact with each other, and further windingother coils having a smaller number of turns on the core sections. Withsuch a construction, the coils having the higher number of turns can bewound by means of an ordina? windin machine, so that the winding of allthe COIlS can be actlitate as compared with thecase where all the coilsare wound by means of a toroidal winding machine.

Furthermore, the deflection efficiency can be improved by the use of acore elliptical in section. Also, the coils having the smaller number ofturns can be effectively insulated from coils previously wound, sincethe former are wound on insulating rings which are mounted on theopposite ends of two core sections so as to serve as means for holdingthe core sections in joined relationship with each other.

What is claimed is:

l. A deflecting yoke comprising:

two core sections formed by longitudinally dividing a ringlike core,

a first pair of coils toroidally wound on said core sectionsrespectively, said coils having a predetermined number of turns,

means for joining said two core sections together into the ringlikeshape,

a second pair of coils toroidally wound on said core sections and saidmeans for joining in such a manner as to cover the joined portions ofsaid core sections, said second pair of coils having a number of turnswhich is less than that of said first pair of coils.

2. -A deflecting yoke according to claim 1, wherein the cross-sectionalconfiguration of said ringlike core is elliptical.

3. A deflecting yoke according to claim I, wherein said means forjoining the two core sections are two insulating rings fitted on theopposite ends of said two core sections thereby to hold said two coresections in fixed relationship to each other.

4. A deflecting yoke according to claim 3, wherein grooves are formed inthe outer peripheries of said insulating rings so that said second pairof coils wound thereon are fitted therein.

1. A deflecting yoke comprising: two core sections formed bylongitudinally dividing a ringlike core, a first pair of coilstoroidally wound on said core sections respectively, said coils having apredetermined number of turns, means for joining said two core sectionstogether into the ringlike shape, a second pair of coils toroidallywound on said core sections and said means for joining in such a manneras to cover the joined portions of said core sections, said second pairof coils having a number of turns which is less than that of said firstpair of coils.
 2. A deflecting yoke according to claim 1, wherein thecross-sectional configuration of said ringlike core is elliptical.
 3. Adeflecting yoke according to claim 1, wherein said means for joining thetwo core sections are two insulating rings fitted on the opposite endsof said two core sections thereby to hold said two core sections infixed relationship to each other.
 4. A deflecting yoke according toclaim 3, wherein grooves are formed in the outer peripheries of saidinsulating rings so that said second pair of coils wound thereon arefitted therein.